Eleutherodactylus eurydactylus, a New Species of Frog from Central Amazonian Peru (Anura: Leptodactylidae)

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Copeia, 1992(4); pp. 1002-1006 Eleutherodactylus eurydactylus, a New Species of Frog from Central Amazonian Peru (Anura: Leptodactylidae) S.

1 Copeia, 1992(4); pp Eleutherodactylus eurydactylus, a New Species of Frog from Central Amazonian Peru (Anura: Leptodactylidae) S. BLAIR HEDGES AND ANDREAS SCHLUTER Eleutherodactylus eurydactylus is described from the region of Panguana and Serrania de Sira in central Amazonian Peru. It is most similar to E. diadematus and E. ventrimarmoratus, and to a lesser degree, E. altamazonicus, E. nigrogrisea, E. platydactylus, and a species being described elsewhere. Together, these seven species, which have very large digital tips, relatively short legs, a tuberculate dorsum, a scapular "W" pattern, and leg barring, are placed in the diadematus group (unistrigatus series) of the subgenus Eleutherodactylus. ALTHOUGH the neotropical frog genus Eleutherodactylus (approx. 500 sp.) is primarily an Andean group in South America, there is a moderate diversity of lowland species (Lynch, 1980). The lowland species tend to have wider distributions; hence, they are better known. Also, there are several lowland sites in Amazonian Ecuador and Per6 which have been visited repeatedly over the years, and for which we have our best knowledge of neotropical anuran communities (Duellman, 1989). One such site is Panguana in central Amazonian Peru, on the lower Rio Llullapichis near its junction with the Rio Pachitea, Provincia de Pachitea, Departamento Huanuco (9?35'S, 74?56'W; 220 m elev.). Schliiter (1984) and Duellman (1989) list 12 species of Eleutherodactylus occurring at Panguana: altamazonicus, carvalhoi, diadematus, imitatrix, lacrimosus, mendax, ockendeni, peruvianus, sulcatus, toftae, variabilis, and ventrimarmoratus. Our comparison of specimens, originally identified as E. diadematus and E. ventrimarmoratus from Panguana and a nearby isolated range (Serrania de Sira) with material of those species from Ecuador, indicates that the central Peruvian frogs represent an undescribed species. In the following account, museum abbreviations follow standardized usage (Leviton et al., 1985), except that MHNJP (Museo de Historia Natural "Javier Prado," Lima) has changed to MHNSM (Museo de Historia Natural de la Universidad Nacional Mayor de San Marcos). Eleutherodactylus eurydactylus sp. nov. Figs. 1, 2 Holotype.-ZMH A01819, an adult female from Panguana, Departamento Huanuco, Peru, 200 m elev., collected by R. Aussem on 21 Sept ? 1992 by the American Society of Ichthyologists and Herpetologists Paratypes.-SMNS 7868, KU , MHNSM 14000, ZIUW 8984, , 8990, 8995, paratopotypes; NMW 4627, Serrania de Sira, 800 m; NMW 4560, Serrania de Sira, 1300 m; NMW 4608, 1380 m. The paratypes of SMNS, MHNSM, and KU were donated by SMH; original numbers SMHA Associated specimens.-nmw 4661, Serrania de Sira, 800 m (see comments below). Diagnosis.-A member of the unistrigatus series (subgenus Eleutherodactylus; Hedges, 1989), characterized by an areolate venter and finger I shorter than II (Lynch, 1976). Its greatly enlarged digital tips, relatively short hind limbs, tuberculate dorsum, dorsal scapular "W" pattern, and leg barring associate E. eurydactylus with E. altamazonicus, E. diadematus, E. platydactylus, E. ventrimarmoratus, and a new species from north central Peru (Departamento San Martin) being described by Duellman. Among these species, E. eurydactylus can be distinguished from E. altamazonicus [ mm SVL (snout-vent length), males; mm SVL females; Lynch, 1980] and E. platydactylus (19 mm SVL males; 30 mm SVL females) by its visible tympanum (concealed, or partially visible in occasional specimens of E. altamazonicus), slightly larger body size ( mm SVL males; mm SVL females), pale (or occasionally with small spots or flecks) venter (not mostly brown or gray as in E. altamazonicus and E. platydactylus), and presence of an inner tarsal fold or tubercle. Additionally, E. altamazonicus has a snout with a pointed tip (rounded in E. eurydactylus); and E. platydactylus has a strongly tuberculate dorsum, and males have vocal slits (absent in E. eurydactylus). The new species from north central Peru differs from E. eury-

HEDGES AND SCHLUTER-NEW ELEUTHERODACTYLUS 1003 Fig. 1. Eleutherodactylus eurydactylus, holotype (ZMH A01819). (A) venter, (B) dorsum. dactylus in being larger (22.7-25.5 mm SVL males; 38.0-38.

2 HEDGES AND SCHLUTER-NEW ELEUTHERODACTYLUS 1003 Fig. 1. Eleutherodactylus eurydactylus, holotype (ZMH A01819). (A) venter, (B) dorsum. dactylus in being larger ( mm SVL males; mm SVL females), lacking an inner tarsal fold, having uniform brown flanks (not pale with distinct diagonal marks), and having a brown venter with pale flecks (not mostly pale with brown flecks). Eleutherodactylus eurydactylus is most similar to E. diadematus ( mm SVL males; mm SVL females) and E. ventrimarmoratus ( mm SVL males; mm SVL females) with which it shares the presence of an inner tarsal fold or tubercle. However, it can be distinguished from E. ventrimarmoratus by its smaller size, visible tympanum (not concealed), and pale or only lightly spotted or flecked venter (not boldly marbled with black; or red and black in life). From E. diadematus, with which it shares the visible tympanum, it can be separated by its smaller size, narrow head (head width less than head length; head width equals head length in E. diadematus), and presence of a short and low inner tarsal fold (or tubercle) less than one-fifth length of the tarsus (not elevated and long, '/s- 1/2 length of tarsus, as in E. diadematus). Also, E. eurydactylus is weakly tuberculate dorsally and weakly areolate ventrally (especially females), not moderate to strongly tuberculate and areolate, as in E. diadematus. One other species, E. orphnolaimus, could be confused with E. eurydactylus, although it does not appear to be closely related. It is similar in size, has a visible tympanum, and greatly enlarged digital tips. A B C S :-- - -/.' di -i n. Fig. 2. Head profile (A) and ventral view of left hand (B) and left foot (C) of Eleutherodactylus eurydactylus, holotype (ZMH A01819). Scale bars = 5 mm.

3 1004 COPEIA, 1992, NO. 4 However, E. orphnolaimus can be easily distinguished by its long, protruding snout with large papilla at tip, large conical eyelid tubercles, and unpatterned concealed surfaces of limbs. Description.-Head as wide as body, width less than length; snout subacuminate in dorsal view, subacuminate in lateral view, not overhanging lower jaw; nostrils weakly protruberant, directed dorsolaterally; canthus rostralis moderately sharp, concave in dorsal view; loreal region slightly concave, sloping gradually; lips not flared; upper eyelid bearing small, subconical tubercles; interorbital space without or with subconical tubercles; supratympanic fold well defined, concealing upper edge of tympanic an- nulus; tympanum moderate-sized, round, separated from eye by a distance less than its own diameter; several postrictal tubercles, small, subconical; choanae moderate-sized, round, not concealed by palatal shelf of maxillary arch when roof of mouth is viewed from below; vomerine odontophores medial and posterior to choanae, each about the same size as a choana, oval, separated narrowly at midline; tongue longer than wide, posterior edge without notch, posterior one-half not adherent to floor of mouth; males without vocal slits. Skin of dorsum weakly tuberculate (see Remarks), without dorsolateral folds; skin of flanks similar to dorsum; skin of venter weakly areolate, without discoidal folds; anal opening not extended in sheath; no glandular areas present; ulnar tubercles subconical; palmar tubercle bifid, larger than thenar, thenar tubercle oval, elevated; several moderate-sized subconical, supernumerary tubercles; subarticular tubercles of fingers oval and subconical, and angled outward; weak lateral ridge on finger; all fingers with expanded tips; fingertips rounded, oblong pad on ventral surface of fingertip; circumfer- ential groove bordering distal two-thirds of finger pad; width of largest pad (III) same size as tympanum; first finger shorter than second when adpressed; heel tubercles small and subconical; small, subconical tubercles along outer edge of tarsus; inner tarsal fold (or tubercle) short, low, and poorly developed (<one-fifth length of tarsus); metatarsal tubercles elevated, inner (elongate) three times size of outer (subconical); several moderate-sized, subconical, supernumerary plantar tubercles; subarticular tubercles of toes oval and subconical; toes unwebbed; weak lateral ridge on toe; all toes with expanded tips; toetips rounded; oblong pad on ventral surface of toetip; circumferential groove bordering dis- tal two-thirds of toe pad; heels overlap when flexed legs are held at right angles to sagittal plane. In alcohol, dorsal ground color is grayish-tan with medium brown to dark brown markings; scapular dark brown "W," bordered anteriorly by two pale markings and posteriorly by the grayish-tan ground color; a narrow, pale interocular bar, bordered anteriorly by the medium brown snout (occasionally with some pale markings) and posteriorly by a narrow, dark brown interocular bar; lores brown like snout, side of head with two wide dark brown bars extending diagonally (one anterior, one posterior) below eye, and a dark brown supratympanic bar; dorsal surface of forelimbs and hind limbs with dark brown bars; groin region, posterior flanks of body, and anterior face of thigh pale with bold, vertical (or slightly diagonal) dark brown bars; posterior (concealed) surface of thigh uniformly dark brown and usually with small pale flecks or spots; ventral ground color white and unpatterned (e.g., SMNS 7868 and most other specimens), tan chin and light tan belly with small brown spots approximately the size of the digital tips (holotype), or pale with extensive brown flecking and small brown spots on belly (KU ); color notes are mainly on ZMH, SMNS, KU, and MHNSM specimens, because others appear to have faded. Measurements.-For the six adult males, four adult females (including holotype), and the holotype (in that order), the measurements are (range, mean? 2SE, in mm): SVL, (21.2? 0.84), ( ), 33.5; head length, (8.53? 0.42), (15.3? 1.06), 14.0; head width, (7.87? 0.42), (13.1? 0.39), 12.6; tympanum length (1.23? 0.11), (1.90? 0.24), 2.12; eye diameter, (3.50? 0.15), ( ), 4.99; eye-naris distance, (2.60? 0.09), (4.54? 0.31), 4.46; thigh length, (10.4? 0.88), (15.7? 0.90), 15.0; shank length, (11.2? 0.45), (17.0? 0.54), 16.3; fingertip (III) width, (1.26? 0.08), (2.07? 0.15), 2.04; toetip (IV) width, (1.11? 0.08), (2.08? 0.19), Etymology.-From the Greek; eury, broad, wide; daktylos, finger; in allusion to the greatly ex- panded digital tips of this species.

4 HEDGES AND SCHLUTER-NEW ELEUTHERODACTYLUS 1005 Distribution.-The four localities for E. eurydactylus are in a relatively small area in the extreme eastern portion of Departamento Huanuco, near the border with Departamento Ucayali (see map and discussion of area in Duellman and Toft, 1979). Elevational distribution from 200 m (Panguana) to 1380 m (Serrania de Sira). Remarks. -This species is considerably variable in several traits, which initially suggested that more than one species was involved. The trait exhibiting the most variation is skin texture. Some specimens have a nearly smooth dorsum and venter (e.g., holotype) whereas others are moderately tuberculate (e.g., NMW 4608). However, two factors appear to be responsible for this variation: (1) sexual dimorphism (males are more tuberculate), and (2) the condition of preservation. The second factor is apparent when specimens in the ZMH, SMNS, KU, and MHNSM are compared with specimens of the same sex in the ZIUW series: the latter are much more tuberculate. Two other variable traits are head shape and the distinctness of the tympanum. In this case, there appears to be an elevational pattern; the lowland frogs (Panguana) have longer snouts, a nearly straight canthus rostralis, and a distinct tympanum; the upland specimens (Serrania de Sira) have shorter snouts, a more concave canthus rostralis, and a partially concealed tympanum (except NMW 4627, which has a distinct tympanum). One of the four upland specimens, NMW 4661, a small (18.2 mm SVL) adult male, is treated as an associated specimen here because it has a nearly smooth dorsum, a darker venter than usual, and a mostly concealed tympanum. Although it is possible that it is an aberrant specimen of E. altamazonicus, the venter is not as dark and the tympanum not as concealed as typical specimens of that species. There is a possibility that the upland specimens of E. eurydactylus from the Serrania de Sira represent a separate (undescribed) species, but additional specimens and comparative data on vocalization and other characteristics will be necessary to address that question. DISCUSSION The apparent relationship between E. eurydactylus and E. diadematus requires a reconsideration of the taxonomic problem surrounding the latter species, which was addressed by Lynch and Schwartz (1972). The holotype of E. diadematus is lost, and the type-locality is unknown. Therefore, the only information associated with this name is that which can be gleaned from the illustration in Jimenez de la Espada (1875). Although most of the characteristics given do not distinguish between the specimens presently recognized as E. diadematus and the new species (E. eurydactylus), the larger body size of the illustrated frog (approx. 40 mm SVL) suggests that the name E. diadematus belongs with larger species from Ecuador and northern Periu. Also, Jimenez de la Espada never collected in central Amazonian Perui where E. eurydactylus occurs. Seven species of the unistrigatus series, E. altamazonicus, E. diadematus, E. eurydactylus, E. ni- grogrisea, E. platydactylus, E. ventrimarmoratus, and the new species from north central Peru, seem to form a group (the diadematus group) by their very large digital tips, relatively short hind limbs, tuberculate dorsum, dorsal scapular "W" (absent in E. nigrogrisea; Lynch, 1969), and prominent leg barring. Within this group (or "assembly"), E. diadematus, E. eurydactylus, and E. ventrimarmoratus form a well-defined subgroup by their moderate to large body size (>33 mm SVL, females) and presence of an inner tarsal fold or tubercle. It could be argued further that E. diadematus and E. eurydactylus are the most similar species pair within this trio, based on their visible tympana (concealed in E. ventrimarmoratus and the other species of the diadematus group). SPECIMENS EXAMINED Eleutherodactylus diadematus.-ecuador: Napo, Lago Agrio, 330 m, KU , ; Rio Yasuni, KU E. altamazonicus.-ecuador: Morona-Santiago, north of Arapicos, USNM ; Miazal, USNM E. platydactylus.-per6: Ayacucho, Huanhuachayoca, 1650 m, KU , E. ventrimarmoratus.-ecuador: Pastaza, Mera, 1140 m, KU ; Abitagua, 8 km NW Mera, 1300 m, ; Morona-Santiago, Limon, USNM Peri: Madre de Dios, Man6, 365 m, KU ACKNOWLEDGMENTS We are indebted to the Peruvian authorities M. Romero Pastor, R. Acero, and J. Purisaca, Direccion Forestal y de Fauna, Ministerior de Agricultura, Lima (permit No DGFF- DC), and N. Carillo de Espinosa and V. R. Morales (Museo de Historia Natural de la Universidad San Marcos, Secci6n Herpetologia, Lima) for their generous cooperation. We thank H.- W. Koepcke (ZMH), W. E. Duellman andj. Simmons (KU), and M. Aichinger (ZIUW, NMW)

1006 COPEIA, 1992, NO. 4 for loan of material; L. R. Maxson for providing some facilities; H.-W. Koepcke for providing the possibility to study anuran ecology at Panguana; A. Thiessen and M.

5 1006 COPEIA, 1992, NO. 4 for loan of material; L. R. Maxson for providing some facilities; H.-W. Koepcke for providing the possibility to study anuran ecology at Panguana; A. Thiessen and M. Schliiter for their help in collecting specimens; and W. E. Duellman and J. D. Lynch for helpful comments on the manuscript. The fieldwork was supported by the Referat fur Graduiertenforderung, Universitit Hamburg and the Deutsche Forschungsgemeinschaft, Bonn. LITERATURE CITED DUELLMAN, W. E Tropical herpetofaunal communities: patterns of community structure in neotropical rainforests, p In: Ecological studies, Vol. 69, Vertebrates in complex tropical systems. M. L. Harmelin-Vivien and F. Bourliere (eds.). Springer-Verlag, New York, New York., AND C. A. TFTr Anurans from the Serrania de Sira, Amazonian Peri: taxonomy and biogeography. Herpetologica 35: HEDGES, S. B Evolution and biogeography of West Indian frogs of the genus Eleutherodactylus: slow-evolving loci and the major groups, p In: Biogeography of the West Indies: past, present, and future. C. A. Woods (ed.). Sandhill Crane Press, Gainesville, Florida. JIMENEZ DE LA ESPADA, M. X Vertebrados del viaje al Pacifico verificado de 1862 a 1865 por una comisi6n de naturalistas enviada por el govierno espafiol, Batracios. Miguel Ginesta, Madrid. LEVITON, A. E., R. H. GIBBS, JR., E. HEAL, AND C. E. DAWSON Standards in herpetology and ichthyology: part I. Standard symbolic codes for institutional resource collections in herpetology and icthyology. Copeia 1985: LYNCH, J. D The identity of the frog, Pseu- dohyla nigrogrisea of Ecuador. Bull. So. California Acad. Sci. 68: The species groups of South American frogs of the genus Eleutherodactylus (Leptodactylidae). Occasional Papers of the Museum of Natural History, Univ. of Kansas 61: A taxonomic and distributional synopsis of the Amazonian frogs of the genus Eleu- therodactylus. Amer. Mus. Novitates 2696:1-24., AND A. SCHWARTZ Taxonomic disposition of some 19th Century leptodactylid frog names. J. Herpetol. 5: SCHLiTER, A Okologische Untersuchungen an einem Stillgewasser im tropischen Regenwald von Peru unter besonderer Beriicksichtigung der Amphibien. Unpubl. Ph.D. diss., Univ. of Hamburg, Hamburg, Germany. (SBH) DEPARTMENT OF BIOLOGY, 208 MUELLER LAB, PENNSYLVANIA STATE UNIVERSITY, UNIVERSITY PARK, PENNSYLVANIA 16802; AND (AS) STAATLICHES MUSEUM FUR NATURKUNDE IN STUTTGART, ROSENSTEIN 1 (SCHLOSS RO- SENSTEIN), D-7000 STUTTGART 1, GERMANY. Accepted 19 Nov

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